Carel Visser, Untitled, 1991, Woodcut

Carel Visser is an important Dutch artist who grew up surrounded by pipes and towers as his father was director of the engineering company Visser & Smit. Consequently, Visser spent a large part of his childhood among the machines. Although the NN Art Collection includes several of his woodcuts and collages, Visser is best known for his sculptures. Which material did he most frequently use?